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SRI PADDY GROWTH AND GHG EMISSIONS AT VARIOUS GROUNDWATER LEVELS
Author(s) -
Setiawan Budi I.,
Imansyah Arief,
Arif Chusnul,
Watanabe Tsugihiro,
Mizoguchi Masaru,
Kato Hisaaki
Publication year - 2014
Publication title -
irrigation and drainage
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.421
H-Index - 38
eISSN - 1531-0361
pISSN - 1531-0353
DOI - 10.1002/ird.1866
Subject(s) - environmental science , greenhouse gas , system of rice intensification , nutrient , groundwater , agronomy , paddy field , yield (engineering) , forestry , agriculture , geography , engineering , biology , ecology , geotechnical engineering , archaeology , materials science , metallurgy
The System of Rice Intensification (SRI) for improving rice production has been attracting worldwide attention for its relatively high yield and greater water productivity (WP). One distinctive characteristic of SRI paddy fields is maintaining groundwater level (GWL) close to the soil's surface as dynamic aerobic–anaerobic soil conditions enhance crop growth. We investigated the performance of SRI paddy rice when subjected to a gradual lowering of GWL to assess the consequences of this for yield, WP, and greenhouse gas (GHG) emissions. Intensive measurements of climate data, plant biomass, soil nutrients, and CH 4 and N 2 O emissions were made in four plots with experimentally different GWLs. Statistical analysis was used to assess differences among the plots, and an artificial neural network (ANN) model was used to track and estimate CH 4 and N 2 O based on measured GWL, soil pH, and soil temperature data. The results showed that a gradually decreasing GWL, as deep as 35 cm from the surface, was able to reduce GHG emissions, but it also produced lower yield and less WP, with correspondingly higher GHG per unit yield. In conclusion, maintaining GWL close to the soil surface would be the best practice for water management in the SRI paddy fields. Copyright © 2014 John Wiley & Sons, Ltd.